DandyDon, you're right, the spots for real diving in Latvia are the many wrecks in the Baltic sea. Like
this one, for instance. Water temperature normally is about 40-45*F, so 50* might feel about balmy, indeed.
Thanks for the link to the Olympic NP. I am much more interested in nature than in cities, and America excels in the beauty of her nature. Couple of years ago I made a trip: San Antonio - Carlsbad Caverns - Roswel - Santa Fe - Taos - Monument Walley - Grand Canyon - Flagstaff - Sedona - Tucson - White Sands Monument. Breathtaking! I understand why many Americans don't travel to other countries - you've got everything in your own!